Reporting Segments and Related Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Customer sales											$ 7,436.6		$ 7,183.2		$ 7,114.7
Net sales	1,885.4		1,806.2	1,893.9	1,851.1	1,719.1		1,695.2	1,856.4	1,912.5	7,436.6		7,183.2		7,114.7
Year-end assets	6,917.0					6,400.8					6,917.0		6,400.8		5,958.6
Depreciation and amortization											299.4		288.6		283.0
Long-lived asset expenditures											417.8	[1]	407.4	[1]	393.7	[1]
Operating Segments [Member]
Segment Reporting Information [Line Items]
Customer sales											7,436.6		7,183.2		7,114.7
Net sales											7,436.6		7,183.2		7,114.7
Year-end assets	5,305.7					4,951.4					5,305.7		4,951.4		4,891.8
Depreciation and amortization											279.6		269.1		268.6
Long-lived asset expenditures											400.4	[1]	395.5	[1]	380.2	[1]
Engine [Member]
Segment Reporting Information [Line Items]
Customer sales											4,990.1		4,884.5		5,030.2
Inter-segment sales											32.0		28.5		20.4
Net sales											5,022.1		4,913.0		5,050.6
Year-end assets	3,519.1					3,299.2					3,519.1		3,299.2		3,329.0
Depreciation and amortization											189.1		177.8		188.6
Long-lived asset expenditures											277.5	[1]	269.9	[1]	264.3	[1]
Drivetrain [Member]
Segment Reporting Information [Line Items]
Customer sales											2,446.5		2,298.7		2,084.5
Net sales											2,446.5		2,298.7		2,084.5
Year-end assets	1,786.6					1,652.2					1,786.6		1,652.2		1,562.8
Depreciation and amortization											90.5		91.3		80.0
Long-lived asset expenditures											122.9	[1]	125.6	[1]	115.9	[1]
Inter-segment eliminations [Member]
Segment Reporting Information [Line Items]
Inter-segment sales											(32.0)		(28.5)		(20.4)
Net sales											(32.0)		(28.5)		(20.4)
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Year-end assets	1,611.3	[2]				1,449.4	[2]				1,611.3	[2]	1,449.4	[2]	1,066.8	[2]
Depreciation and amortization											19.8	[2]	19.5	[2]	14.4	[2]
Long-lived asset expenditures											$ 17.4	[1],[2]	$ 11.9	[1],[2]	$ 13.5	[1],[2]

[1] Long-lived asset expenditures include capital expenditures and tooling outlays.

[2] Corporate assets include investments and advances and deferred income taxes.